Improved peocess of multiplying copies from manuscripts



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ABEL CLAUDE FELIX NIliJPCE DE S'i VICTOR, OF PARIS, FRANCE, ASSIGNOR .TO I. A. NIEPCE DE ST. VICTOR AND M. L. J. LAVATEP Letters Patent No. 73,514, dated January 21, 1868.

IMPROVED PROCESS OF MULTIPLYING COPIES FROM MANUSURIPTS.

TO ALL WHOM IT MAY COIICERN:

Be it known that I, ABEL GLAUDE FELIX NIEPGE DE S1". VICTOR, of Paris, France, have invented A Process for Pulling several Copies or Proofs from any Manuscript, and applications thereof;" and I do hereby declare that the following is a full, clear, and exact description ofthe same.

Any sort of ink can beemployed, but the most effective, and which best allows pulling from an original a number of copies, are inks known and sold in trade as cppyingdnks, used by tradesmen forwrit-ing their correspondence, which is to be afterward copied by the copying-press in the usual manner. I

To pull elf one or more copies of aletter, either of recent or old date, when only one copy thereof is wanted, I slightly moisten, by means of a sponge or brush, a sheet of tissue-paper. When several copies are wanted, such copies, on issuing from thecopying-press must be submitted to the vapor of liquid ammonia, (volatile alkali,) whereby the copy is-made to appear. Many copies may be thus pulled 05', provided the tissue-paper be suitably moistened. Liquid ammonia acts on all inks containing an'organic substance, such as sumach, Campeachy wood, Ste. A' red Campeachy-wood in-k, acidulated, is reproduced in red, but the copy becomes black under the-influence of ammoniacal vapor. In the-same manner a black ink may become red under the.infiuence of any chlorohydric, azotic, or acetic acid vapor. Al-kalies, such as soda, potash, baryta, lime, and cyanide of potassium, will revive invisible writing when the writing is done with transfer-ink. Writing done with Prussianblue-ink can be reproduced many times on being submitted to chlorohydric acid vapor. In fact, all coloredinks containingan organic matter can be reproduced either by an acid or an alkaline vapor, according to the composition' thereof.

In order to facilitate reproduction, and also to increase the number of proofs, the traeing-paper may be previously moistened with any sugared or slimy water, candy, or other sugar, glucose, milk, sugar, or honey. Mucilaginous, gelatinous, or resinous matters will also answer the purpose very well. Tracing-paper thus impregnated with sugared or other viscous water will take an impression even from common ink, either of recent or old datej but transfer-ink is best, and yields a greater number of copies.

To submit the sheet to ammoniacal liquids, or rather. to amm oniacal vapors, a box may be used, into which the sheet is laid, and in which the ammoniacal vapors are introduced by any suitable means. This box may assume the form of those us-ed'in the daguerreotypo process for submitting the plates to iodine or bromine vapors, which boxes are made of glass, china, India rubber, or bitumenized pasteboard, with an emery sliding cover to betterinsure tight closing. Any other suitable apparatus may be employed forsubmitting the sheets to ammoniacal vapors or dipping them into ammoniacal solutions.

I The tracing-paper is to be impregnated, as above described, with either sugar, glucose, or other gummy or slimy vapors, but said ingredients may as eificiently be incorporated with the very paper-pulp during the manufacturing process. In like manner the paper may be partly composed of such materials as are able to develope in proper time the ammonia necessary to the reacti'on by which the writing is made visible.

To pull ofl' fac-similes from registers or bound books, of too large a size to enter the above-mentioned apparatus, the copy is made-by means of apressure exerted by a small board or burnisher, which is rubbed over the writing, a water-proof sheet oi paper beingsuperpcsed on the sheet which is to be copied out.

Having thus described my invention, claim as new, and desire to secure by Letters Patent- 1. The process of taking copies from manuscripts by, submitting the copies, on issuing from the copying- .press, to the action of ammonia-, substantially as herein described. i

2. The treatment of manuscript copies with either alkaline or acid vapors to developc the writing, according to the constituents of the ink, substantially as herein described.

3. The impregnating of the copying-paper with sugar or other adhesive matter, substantially as and forthe purpose herein set forth. i a I NIEPCE' DE ST. VICTOR.

Witnesses:

Vrcroa HAcaiAxN,

LAVIALLE. 

